You might use a different question type, e.g.array(text).
You may insert a dropdown in the first column with "Yes/No" and two or more "normal" text inputs.
Joffm
Or do you want to hide the comment boxes except two or three?
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If you insist on Multiple Choice, then it will be far more complicated, which is why Joffm has suggested a dropdown with "yes/no" which basically has the same effect as a multipe choice.
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